linux-kernel - [PATCH 3.2 012/200] x86/efi: Fix off-by-one bug in EFI Boot Services reservation

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Date:	Mon, 31 Mar 2014 00:23:35 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Dave Young" <dyoung@...hat.com>,
	"Matt Fleming" <matt.fleming@...el.com>,
	"Borislav Petkov" <bp@...e.de>, "Toshi Kani" <toshi.kani@...com>
Subject: [PATCH 3.2 012/200] x86/efi: Fix off-by-one bug in EFI Boot
 Services reservation

3.2.56-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dave Young <dyoung@...hat.com>

commit a7f84f03f660d93574ac88835d056c0d6468aebe upstream.

Current code check boot service region with kernel text region by:
start+size >= __pa_symbol(_text)
The end of the above region should be start + size - 1 instead.

I see this problem in ovmf + Fedora 19 grub boot:
text start: 1000000 md start: 800000 md size: 800000

Signed-off-by: Dave Young <dyoung@...hat.com>
Acked-by: Borislav Petkov <bp@...e.de>
Acked-by: Toshi Kani <toshi.kani@...com>
Tested-by: Toshi Kani <toshi.kani@...com>
Signed-off-by: Matt Fleming <matt.fleming@...el.com>
[bwh: Backported to 3.2: s/__pa_symbol/virt_to_phys/]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/x86/platform/efi/efi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -424,7 +424,7 @@ void __init efi_reserve_boot_services(vo
 		 * - Not within any part of the kernel
 		 * - Not the bios reserved area
 		*/
-		if ((start+size >= virt_to_phys(_text)
+		if ((start + size > virt_to_phys(_text)
 				&& start <= virt_to_phys(_end)) ||
 			!e820_all_mapped(start, start+size, E820_RAM) ||
 			memblock_x86_check_reserved_size(&start, &size,

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